CPC H04W 74/0833 (2013.01) [H04W 72/21 (2023.01); H04W 76/27 (2018.02)] | 17 Claims |
1. A wireless device comprising:
one or more computer processors configured to cause the wireless device to:
generate a physical random access channel (PRACH) preamble mapped to a physical uplink shared channel (PUSCH) resource unit, the PRACH preamble associated with a preamble group indicating a configuration of the PUSCH, the preamble group having a size and a group index indicated by radio resource control (RRC) signaling received by the wireless device from a base station, wherein the group index identifies the preamble group from a plurality of preamble groups;
determine the size of the preamble group using at least one of a ceiling operation or a floor operation performed on a number of contention-based preambles and a number of preamble groups used for a two-step random access channel (RACH);
encode a message comprising the PRACH preamble and a payload carried by the PUSCH, the configuration of the PUSCH comprising parameters for decoding the message; and
transmit the message to the base station, wherein the base station decodes the message based on the parameters of the configuration of the PUSCH indicated by the preamble group.
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